۱- Introduction

۲- Loads modeling for robust life predictions and endurance rig tests

۳- An application of a cooling package mounted on the chassis of a truck

۴- Conclusions

References

Abstract

We focus on applications from the automotive industry, on mechanical components submitted to vibration loads. On one hand, the characterization of loading for dimensioning new structures in fatigue is enriched and updated by customers data analysis. In a second hand, the loads characterization also aims to provide robust specifications dedicated to the simulation or test rigs. We aim to provide vibration specifications that are adapted to a calculation time or physical test durations in accordance with the pace imposed by the projects timeframe. The vibration specifications need to be robust by taking care of the diversity of vehicles and markets considered in the projects. In the trucks industry, the dynamic behavior can vary significantly from one configuration to another. For non-stiff structures, the lifetime depends, among other things, on the frequency content of the loads, as well as the interactions between the components of the multi-input loads. In this context, this paper proposes to compare sets of multi-input loads applied on the non-stiff structure, i.e for which the frequency content of loads impacts the damage.

Introduction

Durability feature aims to understand and predict failure modes and fatigue phenomena in structures submitted to in-service loads, that are constant or variable amplitude loads. This paper focus on application from automotive industry, especially trucks. We concentrate on load vibration applied on mechanical components. One of the targets of the loads characterization is to capture damaging events and model them (Johannesson & Speckert, 2014). Loads model is necessary for different reasons: to adapt the rig capability where the components is tested, to understand the scatter of a population of customers, to compare them. The trucks architecture impacts the load environment of components of the truck (e.g chassis packaging hung on the chassis). The manufacturers aim to get common structures among different trucks silhouettes. For dimensioning new structures, loads from different trucks need to be compared, in order to identify the most severe truck configuration. An approach to compare variable amplitude multi-input loads applied on non-stiff structures is proposed. After the method description, a two-input example is presented. A cooling package installed on different trucks architecture is used as an illustration.